[Mesa-dev] [PATCH 00/10] glsl: Implement varying packing.

[Paul Berry]

On 12 December 2012 00:02, Eric Anholt <eric at anholt.net> wrote:

> Paul Berry <stereotype441 at gmail.com> writes:
>
> > This patch series adds varying packing to Mesa, so that we can handle
> > varyings composed of things other than vec4's without using up extra
> > varying components.
>
> Results for glbenchmark 2.7 at 320x240 (units of fps):
>
>     N           Min           Max        Median           Avg        Stddev
> x 109            86            87            86     86.027523    0.16435709
> + 109            86            87            87     86.963303    0.18888589
> Difference at 95.0% confidence
>         0.93578 +/- 0.0470052
>         1.08777% +/- 0.0546397%
>         (Student's t, pooled s = 0.177047)
>
> I chose a tiny resolution here to try and focus on the path that we
> think this will help in (clipping overhead reduction).  The stupid app
> prints an integer fps, so it can be hard to get any signal out of small
> changes at higher resolutions.
>

I'm not sure which line is with varying packing and which line is without.
 Is this an improvement or a performance degradation?
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